Precision PH Meter Water Tester Stock No: 35671 TE Portable precision pH test pen for Lab or general use. Range: 0-14pH Resolution: 0.01pH Accuracy: +/- 0.01pH Operating Temp: 0-60C Power: 2 X LR44 Button Cells Includes Plastic Storage Case & Powder to make up Cal Solutions NOTE: Additional Callibration Powders Order 35750-TE